EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
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5/21/2018 | 2:45 PM - 3:00 PM | COMPARING THE ROLE OF BIOTIC AND ABIOTIC FACTORS INFLUENCING PHOSPHORUS CYCLING IN CONSTRUCTED FLOODPLAINS OF MULTIPLE AGRICULTURAL STREAMS | 420 B
COMPARING THE ROLE OF BIOTIC AND ABIOTIC FACTORS INFLUENCING PHOSPHORUS CYCLING IN CONSTRUCTED FLOODPLAINS OF MULTIPLE AGRICULTURAL STREAMS
Maximizing nutrient removal from agricultural streams is one mechanism for alleviating eutrophication to downstream water bodies such as Lake Erie. The construction of inset floodplains in agricultural streams/ditches can increase nutrient removal, yet the impact of floodplains on phosphorus (P) dynamics is understudied compared to nitrogen. We examined the role of biotic and abiotic processes influencing P pools and fluxes on inset floodplains of three agricultural streams in northern Indiana. We predicted that P dynamics would be driven by both P assimilation via soil microbial activity (i.e., respiration; R) and Fe-associated sorption influencing P during soil drying and rewetting. Soil respiration was significantly different among floodplains and was correlated with soil organic matter content, linking microbial P assimilation with carbon availability. The Fe pools also varied significantly among sites, and we found that Fe and available P were significantly correlated, suggesting that Fe-associated P adsorption may vary substantially. Overall, both biotic P assimilation and a strong potential for abiotic P sorption exist in these floodplains; however, the ability of any individual floodplain to remove water column P will vary with soils and their associated physiochemical characteristics.
- Phosphorous
- Conservation
- Restoration
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Presenters/Authors
Matt Trentman
(), Flathead Lake Biological Station, University of Montana, matt.trentman@flbs.umt.edu;
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Jennifer L. Tank
(), University of Notre Dame, tank.1@nd.edu;
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Todd V. Royer
(), Indiana University Bloomington, troyer@indiana.edu;
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Sara McMillan
(), Purdue University, mcmill@purdue.edu;
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Alex Johnson
(), Purdue University, john1963@purdue.edu;
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